Laravel + VueJS完成系统

问题描述

我已经花了好几个小时来为完成系统定义我的关系，但是我失败了。

我有一个表Users和一个表Episodes，如果用户已完成一集，我想进入我的视图。

我用user_id和Episode_id和一个名为“ completed”的布尔字段创建了一个“ completions”表

这有很多关系吗？我想要一个类似$ episode-> completed的东西，如果登录的用户完成了课程，则给我True，但是我找不到自己的路...我只想知道如何定义我的关系，而不是整体完成的工作。

非常感谢您！!!!

解决方法

我相信您可以告诉Laravel使用哪个表，还可以查询数据透视列。

//user model
public function episodes(){
    return $this->belongsToMany( 'App\Episode','completions','user_id','episode_id' );
}
public function completedEpisodes(){
    return $this->belongsToMany( 'App\Episode','episode_id' )
    ->wherePivot('completed','=',true)->get();
}

//episode model
public function users(){
    return $this->belongsToMany( 'App\User','episode_id','user_id' );
}

另一种选择是创建您的数据透视表，因为Episode_user和laravel会自动将其检测为数据透视表，向该表中添加一个完整的布尔值，并且它将仅使用：

//user model
public function episodes(){
    return $this->belongsToMany('App\Episode');
}
public function completedEpisodes(){
    return $this->belongsToMany('App\Episode')
    ->wherePivot('completed',true)->get();
}

//episode model
public function users(){
    return $this->belongsToMany('App\User');
}

查询剧集是否完整：

//也许没有尝试过

//user
    public function hasCompletedEpisode($id){
        return $this->belongsToMany('App\Episode')->wherePivot('episode_id',$id)
        ->wherePivot('completed',true)->get();
}

//episode
    public function hasCompletedEpisode($id){
    $user_id = Auth::id();
    return $this->belongsToMany('App\User')->wherePivot('user_id',$user_id)
    ->wherePivot('completed',true)->get();
}

,

如果我是你，我会使用custom intermediate table。您可以按以下方式实现此功能：

迁移

Schema::create('users',function (Blueprint $table) {
    $table->bigIncrements('id');
    $table->string('name');
    $table->timestamps();
});

Schema::create('episodes',function (Blueprint $table) {
    $table->bigIncrements('id');
    $table->string('name');
    $table->timestamps();
});

Schema::create('watches',function (Blueprint $table) {
    $table->bigIncrements('id');
    $table->unsignedBigInteger('user_id');
    $table->unsignedBigInteger('epsiode_id');
    $table->boolean('completed');
    $table->timestamps();
});

模型

class User extends Model
{
    protected $guarded = [];
    
    public function watchedEpisodes()
    {
        return $this->hasMany(Episode::class)->using(Watch::class);
    }
    
    public function watches()
    {
        return $this->hasMany(Watch::class);
    }
}

class Episode extends Model
{
    protected $guarded = [];
    
    public function users()
    {
        return $this->hasMany(User::class)->using(Watch::class);
    }
}

class Watch extends \Illuminate\Database\Eloquent\Relations\Pivot
{
    protected $table = 'watches';
    protected $guarded = [];
    
    public static function create(User $user,Episode $episode,bool $completed = false)
    {
        $watch = new self();
        $watch->user_id = $user->id;
        $watch->epsiode_id = $episode->id;
        $watch->completed = $completed;
        $watch->save();
        
        return $watch;
    }
    
    public function user()
    {
        return $this->hasOne(User::class);
    }
    
    public function episode()
    {
        return $this->hasOne(User::class);
    }
}

示例用法

$user = User::create(['name' => 'Big Watcher']);

$episode1 = Episode::create(['name' => 'Episode 1']);
$episode2 = Episode::create(['name' => 'Episode 2']);
$episode3 = Episode::create(['name' => 'Episode 3']);
$episode4 = Episode::create(['name' => 'Episode 4']);

Watch::create($user,$episode1);
Watch::create($user,$episode2);
Watch::create($user,$episode3);

return $user->watchedEpisodes;